Diff: idDHTLib.h

Revision:

0:53913db38502

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/idDHTLib.h	Tue Nov 19 19:36:47 2013 +0000
@@ -0,0 +1,87 @@
+/*
+    FILE:       idDHTLib.h
+    VERSION:    0.0.3
+    PURPOSE:    Interrupt driven Lib for DHT11 and DHT22 for mbed.
+    LICENCE:    GPL v3 (http://www.gnu.org/licenses/gpl.html)
+    DATASHEET: http://www.micro4you.com/files/sensor/DHT11.pdf
+    DATASHEET: http://www.adafruit.com/datasheets/DHT22.pdf
+    
+    Based on idDHT11 library: https://github.com/niesteszeck/idDHT11
+    Based on DHTLib library: http://playground.arduino.cc/Main/DHTLib
+    Based on code proposed: http://forum.arduino.cc/index.php?PHPSESSID=j6n105kl2h07nbj72ac4vbh4s5&topic=175356.0
+    Mbed port of Arduino library: https://github.com/niesteszeck/idDHTLib
+    
+    Changelog:
+        v 0.0.1
+            fork from idDHT11 lib
+            change names to idDHTLib
+            added DHT22 functionality
+        v 0.0.2
+            Optimization on shift var (pylon from Arduino Forum)
+        v 0.0.3
+            Timing correction to finally work properly on DHT22
+            (Dessimat0r from Arduino forum)
+ */
+
+#ifndef idDHTLib_H__
+#define idDHTLib_H__
+
+#define IDDHTLIB_VERSION "0.0.3"
+#include "mbed.h"
+
+// state codes
+#define IDDHTLIB_OK         0
+#define IDDHTLIB_ACQUIRING      1
+#define IDDHTLIB_ACQUIRED       2
+#define IDDHTLIB_RESPONSE_OK        3
+
+// error codes
+#define IDDHTLIB_ERROR_CHECKSUM     -1
+#define IDDHTLIB_ERROR_TIMEOUT      -2
+#define IDDHTLIB_ERROR_ACQUIRING    -3
+#define IDDHTLIB_ERROR_DELTA        -4
+#define IDDHTLIB_ERROR_NOTSTARTED   -5
+
+#define IDDHTLIB_CHECK_STATE        if(state == STOPPED)            \
+                        return status;          \
+                    else if(state != ACQUIRED)      \
+                        return IDDHTLIB_ERROR_ACQUIRING;
+                                    
+class idDHTLib
+{
+public:
+    idDHTLib(PinName pin, void (*isrCallback_wrapper)());
+    void init(PinName pin, void (*isrCallback_wrapper)());
+    void dht11Callback();
+    void dht22Callback();
+    int acquire();
+    int acquireAndWait();
+    float getCelsius();
+    float getFahrenheit();
+    float getKelvin();
+    double getDewPoint();
+    double getDewPointSlow();
+    float getHumidity();
+    bool acquiring();
+    int getStatus();
+    
+private:
+    Timer t;
+    void (*isrCallback_wrapper)(void);
+    pFunctionPointer_t  handler;
+    enum states{RESPONSE=0,DATA=1,ACQUIRED=2,STOPPED=3,ACQUIRING=4};
+    volatile states state;
+    volatile int status;
+    volatile char bits[5];
+    volatile char cnt;
+    volatile char idx;
+//    volatile int us;
+    
+    DigitalInOut inOut;
+    InterruptIn intIn;
+    PinName pin;
+    volatile float hum;
+    volatile float temp;
+    void isrCallback(bool dht22);
+};
+#endif // idDHTLib_H__
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